Instead of offering a note of praise like after past losses, Trump's Tuesday-night statement leveled a bevy of attacks against "Lyin' Ted Cruz." Among other things, the statement accused Cruz of illegally coordinating with super PACs supporting his campaign, though he did not specify any evidence for his claim.

The Trump camp also claimed that its candidate "withstood the onslaught of the establishment yet again" and noted that Cruz had the support of Wisconsin Gov. Scott Walker and a number of local conservative radio hosts.

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'He is a Trojan horse': Donald Trump rages after getting crushed in Wisconsin

5. John Kasich

Kasich picked up momentum last month with a win in his home state's primary.

But he has no chance to accumulate enough delegates to clinch the nomination before the convention, so he's banking that he can win a floor fight. Kasich's rivals are growing increasingly frustrated with his presence in the race — Trump said he would "automatically win" if Kasich dropped out of the race.

Those who talk up Kasich say he is a successful governor of a swing state with a record to point to and clear bipartisan appeal. He also has abundant experience from nearly two decades in Congress, including foreign-policy areas and his time as chair of the US House budget committee.

But that same bipartisan brand has hurt Kasich with the GOP base. He is to the left of most GOP candidates on immigration reform, and he expanded the federal Medicaid program under the Affordable Care Act — two issues that could doom him with hard-line conservatives.

National polling average among Republican voters: 20.6% (3rd)
Average in Wisconsin, New York, Pennsylvania polls: 20.3% (3rd)

DELEGATES: 143
STOCK: Neutral
Last month: 5

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(Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

4. Bernie Sanders

Sanders had perhaps the best single day of his campaign late last month, romping to landslide victories in Alaska, Hawaii, and Washington. He has won five of the past six Democratic contests.

Still, he faces challenging odds — he needs to win about 57% of the remaining pledged delegates to overtake Clinton in the delegate count.

Moving forward, the map doesn't look especially favorable: About 65% of the remaining delegates come from large states like California, New York, Pennsylvania, New Jersey, and Maryland.

National polling average among Democratic voters: 42.8% (2nd)Average in Wisconsin, New York, Pennsylvania polls: 39.3% (2nd)

DELEGATES: 980
STOCK: Neutral
Last month: 4

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REUTERS/Jim Urquhart

3. Ted Cruz

Cruz looks positioned to take down Trump in Wisconsin. After that, the map gets more challenging.

Late April is dominated by Northeast and mid-Atlantic contests more favorable to Trump — including delegate-rich New York, where polls have showed Trump above 50% in the state.

Cruz inspires a flood of enthusiasm among the GOP base, and he may be the best-positioned candidate from within the political sphere to back up the notion that he's not a typical politician, that he is the outsider the base wants despite his day job in Washington.

And his eye-popping fund-raising numbers mean he could be in the race for the long haul — perhaps all the way to the convention.

National polling average among Republican voters: 32.8% (2nd)Average in Wisconsin, New York, Pennsylvania polls: 27.1% (2nd)

DELEGATES: 463
STOCK: Neutral
Last month: 3

REUTERS/Charles Mostoller

2. Donald Trump

Trump has lit the political world on fire since his entry into the race last summer, and he has showed surprising staying power. We're now on month No. 11 of "The Trump Show."

He has won a majority of contests so far, a feat unthinkable when he entered the race in June. And he appears poised to at least go into the convention with the most delegates of any Republican candidate.

There's a clear appetite among Republican primary voters for someone like Trump, who entered the race to controversy surrounding his position on illegal immigration. Business Insider discovered more of that when we followed him on the trail for a week last year.

National polling average among Republican voters: 40.4% (1st)Average in Wisconsin, New York, Pennsylvania polls: 41.9% (1st)

DELEGATES: 736
STOCK: Neutral
Last month: 2​

REUTERS/Adam Bettcher

1. Hillary Clinton

The delegate math is on Clinton's side going forward, even as she faces a potential loss in Wisconsin and a fight with Sanders in her adopted home state of New York.

The long-presumed Democratic nominee, Clinton has been a shakier-than-expected candidate. But she has a clear look at the nomination, and she would enter the general election with a slight advantage over Trump or Cruz.

National polling average among Democratic voters: 50.2% (1st)Average in Wisconsin, New York, Pennsylvania polls: 51.3% (1st)

DELEGATES: 1,243
STOCK: Neutral
Last month: 1

​

REUTERS/Lucas Jackson

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Trump had aggressively campaigned in Wisconsin and repeatedly predicted that he would win there. He barnstormed the state for days in hopes of catching up to Cruz after the senator started to pull ahead, holding six Wisconsin rallies between Saturday and Monday.

The billionaire still is hoping to salvage a few of the 42 delegates at stake. Although winning the statewide vote guarantees Cruz a batch of delegates, Trump can gain three delegates for each congressional district he wins. The data-journalism website FiveThirtyEight reported that Trump was competitive in two of the state's eight districts.

Read the full statement below:

Donald J. Trump withstood the onslaught of the establishment yet again. Lyin' Ted Cruz had the Governor of Wisconsin, many conservative talk radio show hosts, and the entire party apparatus behind him. Not only was he propelled by the anti-Trump Super PAC's spending countless millions of dollars on false advertising against Mr. Trump, but he was coordinating `with his own Super PAC's (which is illegal) who totally control him. Ted Cruz is worse than a puppet--- he is a Trojan horse, being used by the party bosses attempting to steal the nomination from Mr. Trump. We have total confidence that Mr. Trump will go on to win in New York, where he holds a substantial lead in all the polls, and beyond. Mr. Trump is the only candidate who can secure the delegates needed to win the Republican nomination and ultimately defeat Hillary Clinton, or whomever is the Democratic nominee, in order to Make America Great Again.